Method of making molds



J. T. STONEY.

METHOD OF MAKING MOLDS.

APPLICATION FILED MAR. 1,1919;

1,843,941. Patented June 22, 1920.-

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METHOD OF MAKiNG MOLDS.

- APPLICATION FILED MAR. l, 1919.

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METHOD or MAKING ivioLns.

Application filed March 1,

To all whom it may concern:

Be it known that I, JOHN T. STONEY, a resident of the United States, residing at Cleveland, in the county of Cuyahoga and- State of Ohio, have invented a certain, new and useful Improvement in Methods of Making Molds, of which the following is a full, clear, and exact description.

The present invention relates to a method of preparing a mold in which the core s made in part of green sand.

The usual method in making sand cores, especially'large cores, is to mix sand with a suitable cohesive agent, mold the core in a core box, remove the core and bake it. Some times, for convenience, these cores are made in sections.

Such cores are valueless after usage, as the baked sand can not be reused. Furthermore, such cores are expensive to make, due' to the labor involved in the fabrication thereof and in the baking.

A green sand core has very little inherent strength, and the larger cores do'not have sufiicien't strength to support their own weight, but when a green sand core is used, the. saving in cost and the preparation thereof is a very important item, as well as the saving'in time in the making, by doing away with the necessity for baking. v

'Generally speaking, the invention herein disclosed may be said to comprise the ele me'nts and the combinations thereof set forth in the accompanying claims.

Reference should be had to the accompanying drawings forming part of this specification, in which Figure l is a sectional elevation of portions of a molding machine with'a pattern and mold drag thereon. Fig- 40 2 is an' elevatron with portions and sections \of parts of the molding machine shown in ig. with the drag of the mold drawn rom the pattern. Fig. 3 is an elevation with portions and sections showing a roll over table, having a 4 is an elevation with portions and sections showing a roll over table with core box thereon, having a green sand core portion withabaked sand core portion. Fig. 5 is an endelevation of the showing in Fig. 4. Fig.

6 is an elevation with portions and sections showing the assembly illustrated in Fig. 4 and having the drag portion of a mold positioned on the core box. Fig. 7 is an elevation with portions and sections showing the copeof the mold core box thereon. Fig.

1919.. Serial No, 280,074.

Specification of Letters Patent. Pate ted' J ne 22, 1920.

core box and drag of a mold inverted. .Fig. i

'8 shows in sectional elevation a completed mold.

The method which forms the subject matter of the present. invention may be more readily understood by describing the steps in the making of'a mold in connection the accompany ng drawings.

lhese drawings show various wellknown molding mechanisms and are intended to merely conventionally represent the same as I consider it within the province of this invention to utilize-.other-forms of apparatus than that s'pecifically. shown, where the method may be conveniently so practised.

In Fig. 1, 1 indicates a-platform to which is secured a pattern 2., Lying above the plat-' form and cooperating with the table 1 is a stripping plate 3. plate are carried upon uprights 4 and 5. The table 1 is adapted to be jarred by some suitable mechanism not shown, which is a common practice in the art;

The ends ofthe stripping At 6 there is indicated a flask which with its contained sand is' destined to form the drag portion of a completed mold.

In Fig. 2 the same apparatus as shown in 1 is illustrated, stripping plate has table 1 so that the from the pattern.

' In-ig. 3, 8 illustrates a table of the roll over type, that is to say, one which is so mounted that it may be inverted to a posibe'en raised from the drag 6 has been drawn .tion 180 angular degrees from thatwhich is shown in Fig. 3. Y

. Upon the'table 8 is secured a corebox 9, which is so formed as to mold a core suitable to .go'with the drag 6, and with the which is not herein illus trated; In the core box 9 the core portion 10 is molded of green sand, and in the molding of the core, usual methods may be employed as well known in the art.

When the green sand core 10 has been prepared there is placed in contact therewith and on top thereof a complementary core portion 11, which has been previously prepared by molding and baking, by processes which are well known in the art.

The baked sand core has inherent strength, due to its method of preparation, and is sufficiently strong, not only to support its own weight, but to support the weight of the green sand core as well.

but .in this figure the.

lVhen the baked sand core has been positioned as illustrated in Fig. l the drag 6 which has been previously prepared is brought into position above the core box 9 and lowered into contact with the core box and in proper position with respect to'the baked core portion 11. The drag 6 is in suitable manner clamped to the table 8 and the table is rolled over into a position shown in Fig. 7 so that the green sand core 10 is superimposed upon the baked core '11 and the drag 6 is beneath the core.

In this position the core box 9 is withdrawn, preferably by raising the table 8, and to accomplish this a suitable support is provided for the drag 6, whichin the present instance is a car 12 which is run under the drag 6 before the core is drawn.

When the core box is drawn, there remains the drag 6 which receives and supports the'opposite end core portion 11, and this portion 1] in turn supports the green core portion 10.

The cope for the mold has meanwhile been prepared and is brought into proper position with respect to the drag (5 and the core as illustrated in Fig. 8.

The completed mold as illustrated, is maintained in its shown position, that is to .say, 'withthe drag of the mold below the co e of the mold until the mold is poured.

t Will be apparent from the foregoing description that the baked sand portion of the mold forms a support for the green sand portion, and thus I am enabled by this method to use a composite core of green sand and dry sand, which requires much less labor in p eparation than where the core is made entirely of baked sand, and can be roduced at a less cost.

he method. by which the green sand core is prepared and deposited upon the baked sand portion of-the core insures that there Will be no displacement of the sand of the green portion of the core, as the core box with the green sand core is inverted while the core is still in the box, and the core box drawn in a vertical direction.

Furthermore, by the method described, the composite core is placed in the mold, by the apparatus which forms the core, so that the core is positioned with absolute precision, and there is no man handling of the core with its attendant dangers in moving the same, or possibility of incorrect posi- 56 tioning in the mold.

Having described my 1nvention,I claim 1. The method of maklng a mold whlch comprises preparing the drag part of a mold, preparinga green sand sectional part 60 of the core in a core box, placing a previously baked sand complementary section of a core in conjunction with the green sand part of the core while the green sand core is still in its box, placing the drag of the 5 mold over the baked sand portion of the core, turning over the drag and core box to-. gether, so that the green sand part of the core is resting upon the baked sand portion of the core, removing the core box, preparing the cope part of the mold and placing the same upon the drag part of the mold.

2. The method of making a mold, which v comprises preparing the drag part of a mold, preparing a green sand half section portion is still in its box, placing the drag of the mold over the baked sand portion of the core, inverting the drag and core box together so that the green sand part of the core rests upon the baked sand portion of the core, the baked sand portion of the core being supported by the drag of the mold, removing the core box, preparing the cope part of the mold and placing the same upon the drag part of the mold.

3. The method of making a mold which comprises preparing the drag part of a mold, preparing a green sand half section ofa core in a core box, placing a previously prepared bakedsa'nd complementary section of the core upon the green sand part while the said green sand part is still in its box, placing the drag of the mold over the baked sand portion of the core, invertin'gthe drag of the mold and core box together, so that the green sand part of the coreis resting upon the baked sand portion of the core, removing the core box vertically from the green. sand portion of the core, preparing the cope part of the mold and placing the same upon the drag part of the mold.

In testimony whereof, I hereunto allix my signature.

JOHN T. STONEY. 

